rpc/chain_spec: Add tests

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

client/rpc-spec/src/chain_spec/mod.rs

@@ -28,6 +28,9 @@
 //!
 //! Methods are prefixed by `chainSpec`.
 
+#[cfg(test)]
+mod tests;
+
 pub mod api;
 pub mod chain_spec;
 

client/rpc-spec/src/chain_spec/tests.rs

@@ -0,0 +1,61 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2017-2022 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+use super::*;
+use jsonrpsee::{types::EmptyParams, RpcModule};
+use sc_chain_spec::Properties;
+
+const CHAIN_NAME: &'static str = "TEST_CHAIN_NAME";
+const CHAIN_GENESIS: [u8; 32] = [0; 32];
+const CHAIN_PROPERTIES: &'static str = r#"{"three": "123", "one": 1, "two": 12}"#;
+
+fn api() -> RpcModule<ChainSpec> {
+	ChainSpec::new(
+		CHAIN_NAME.to_string(),
+		CHAIN_GENESIS,
+		serde_json::from_str(CHAIN_PROPERTIES).unwrap(),
+	)
+	.into_rpc()
+}
+
+#[tokio::test]
+async fn chain_spec_chain_name_works() {
+	let name = api()
+		.call::<_, String>("chainSpec_unstable_chainName", EmptyParams::new())
+		.await
+		.unwrap();
+	assert_eq!(name, CHAIN_NAME);
+}
+
+#[tokio::test]
+async fn chain_spec_genesis_hash_works() {
+	let genesis = api()
+		.call::<_, String>("chainSpec_unstable_genesisHash", EmptyParams::new())
+		.await
+		.unwrap();
+	assert_eq!(genesis, format!("0x{}", hex::encode(CHAIN_GENESIS)));
+}
+
+#[tokio::test]
+async fn chain_spec_properties_works() {
+	let properties = api()
+		.call::<_, Properties>("chainSpec_unstable_properties", EmptyParams::new())
+		.await
+		.unwrap();
+	assert_eq!(properties, serde_json::from_str(CHAIN_PROPERTIES).unwrap());
+}